These included having drugs in his possession for sale or supply on January 18 last.

The charges, all brought contrary to the Misuse of Drugs Act, involve drugs including N Bomb, DMT, MDMA and cannabis.

Jessica O'Connor (20) of Rosebank House, Ballyhar, Killarney, Co Kerry pleaded guilty to a single charge of conspiring with another to possess a controlled drug, namely N Bomb, for sale or supply in Cork city on January 18 last.

Last June, a Cork Coroner’s Court inquest into the death of Mr Ryan heard from Assistant State Pathologist Dr Margaret Bolster that he died from hypoxic ischemic encephalopathy due to cardiac arrest after ingesting a psychedelic drug.

Judge Sean O'Donnabhain remanded on three on continuing bail for sentencing on Wednesday (November 23).